The U.S. market won’t be getting the Mercedes-Benz CLS Shooting Brake but fans of the wagon may still be excited for the possibility that Porsche and McLaren may offer their own variants. At this September’s Paris Motor Show, the German automaker will introduce a concept shooting brake model based on the Panamera.

Porsche wants to play it safe and wait if the CLS Shooting Brake is successful before it decides if it will present a Panamera Shooting Brake to its lineup.

Once it is approved for production, it’s likely to arrive in the market in 2015 for Porsche’s next generation models.

With regards to a McLaren Shooting Brake, it was initially believed that a Ferrari FF rival would by the British automaker last April.

According to German magazine Autobild, the MP4-12C Shooting Brake may make its debut before the end of 2013. It will be powered by the same 3.8-liter twin turbo engine that is used on the current model.

The exterior features of the Porsche Panamera Sport Turismo give us a preview of the future Porsche sports vehicle: short overhangs, a large boot lid, and both efficient and athletic. The concept vehicle puts together the proportions of a prime car with the inside comfort of a luxury vehicle. The width of the Sport Turismo is at 1,990 mm, its height at 1,401 mm and length at 4,950 mm.

Its direction signals and sidelamps are installed in C-shaped lighting housings - also popular as C-Blades - located in the huge air inlets at the front. Combined with four-point LED headlamps with a modern design, they outline the front end of the concept vehicle.

The taut and smooth body is uninterrupted by additional elements – even traditional mirrors are not seen. Replacing them are two cameras installed in the side air outlets of the Sport Turismo and its images are on the cockpit displays.

The back end has been completely overhauled, but it still keeps all of the attributes of a Porsche. The back lights in LED technology and the taillamp panel with the "Porsche" trademark are seen in 3D, and the brake light is situated in the middle of the four-point LED backlamps. Shaping the end of the roof is a flexible carbon back spoiler that produces better downforce.

The latest Liquid Metal Blue shade provides the concept vehicle a surface that is similar to liquid metal and emphasizes its curves and style lines more prominently. The wheels in twin-spoke design have a two-tone appearance, and the brake callipers are colored Acid Green. The wheels' hub locks show the Porsche unique style - totally motorsport.